[DNSOP] Tell me about the ISO 3166 user assigned two-letter codes and TLDs

["John Levine" <[e-mail]>]

I don't think this has anything to do with RFC 6761, so ...

For a very long time, two letter TLDs have been assigned to countries
and other geographic entities per the ISO 3166 alpha-2 list.  The
earliest mention I can find is in RFC 920 in 1984, and even then the
wording suggests that the usage was well settled.

The codes AA, QM-QZ, XA-XZ, and ZZ are "user assigned" and will never
be used for countries.  Last year Ed Lewis wrote an I-D proposing that
XA-XZ be made private use and the rest future use, but as far as I can
tell it never went anywhere.

I've been telling people that if they need a fake private TLD for their local
network they should use one of those since it is exceedingly unlikely
ever to collide with a real DNS name.  Am I right?

R's,
John

PS: On my lan, I'm using .QY.